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tt no boost...help??

Started by Mbooma, Feb 19 2014 01:11 PM

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#61 Mbooma

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Posted 27 February 2014 - 01:14 PM

Well can sumone give me a link or a nooby simple diy lol

#62 Tim.

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Posted 27 February 2014 - 01:16 PM

That pretty much is the whole DIY!

#63 Mbooma

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Posted 27 February 2014 - 01:19 PM

Haha yea but i dono wat half of that is lol sorry im so over welmed with all of this

#64 WillC

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Posted 27 February 2014 - 01:52 PM

Best to get someone in your area to show you.



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#65 Mbooma

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Posted 27 February 2014 - 02:05 PM

Ok ...

ANY TAKERS????

lol

#66 Robbks

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Posted 27 February 2014 - 03:39 PM

So no boost spikes once you remove the ECV duty solenoid? The system uses the ECV as a wastegate of sorts to manage boost. That would be the only downside to this mod that I can see.

But hey any solenoids and vac lines that you can remove without causing other issues sounds like a good mod.

Nope,
this mod (when tuned correctly) actually makes the engine use the exhaust gas pressure to force the ECV open a little earlier than the ECU actually would open it, so it starts stealing boost from the primary sooner (it's well and truly maxxed out but 4000rpm when this is happening) and no spiking occurs.
have it over-tight and you might get spiking, but the wastegate on the B4 primary is sufficient to cope.
good dump pipes really help these things so does porting out the ECV to allow more flow into the secondary.

I was using stand alone, closed loop boost control anyway 
A good strategy is to flatten the boost off as you get to the changeover point as you want the wastegate to be closed when the ECV begins to open so you're not wasting energy blowing exhaust gas out the wastegate instead of into the secondary.

I don;t believe this will rally help the OP's issue unless the ECV is stuck open.



 


#67 allpaw4

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Posted 27 February 2014 - 04:02 PM

I know this is a little off topic, but which turbo is the wastegate actually on? I know only one turbo has it of the two.

MY00 Red RX, a nice daily that was sold off once the B4 became reliable...
MY02 Blue B4, aka 'The Project' - v8 JDM STi engine package and assorted other 'goodies' - Sold, then bought back for parts. Stripped and crushed.
MY03 Blue RX, the newer old daily, pretty well more B4 than RX now... In the process of being converted to the track toy... Watch this space!
MY02 Silver Wagon, H6 conversion, full blue/black leather and almost full black interior to go with it.
MY03 White/Silver H6 Outback, donor car for silver waghoon.
MY97 Silver RX, acquired to become track car, but plans changed. To be stripped and scrapped in time.

#68 WillC

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    Most things with a pulse. Most things that tick and have electric.

Posted 27 February 2014 - 04:13 PM

I thought they both had one. When I took mine out there was a small one on secondary and a giant one on the primary


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Address : 8/88 Seville Street
Fairfield East NSW 2161
PH : (02) 9755 9882

#69 Tim.

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Posted 27 February 2014 - 04:21 PM

Yeah the mod definitely makes sense as you're still getting boost pressure in the top side of the ECV. Mine's tuned to bleed some gasses earlier to help pre-spool the secondary so i'm not sure this will make much difference in my case. The only thing I might try is a 2.0mm pill in the IACV line to slow down the opening of the valve.

And yes I agree, you want the wastegate to be shut during changeover so you're not wasting exhaust.


@Ben - Wastegate's on the Primary side

#70 allpaw4

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Posted 27 February 2014 - 04:55 PM

Yea, ok, I thought so. One of mine had nothing. The casting was missing everything associated.

MY00 Red RX, a nice daily that was sold off once the B4 became reliable...
MY02 Blue B4, aka 'The Project' - v8 JDM STi engine package and assorted other 'goodies' - Sold, then bought back for parts. Stripped and crushed.
MY03 Blue RX, the newer old daily, pretty well more B4 than RX now... In the process of being converted to the track toy... Watch this space!
MY02 Silver Wagon, H6 conversion, full blue/black leather and almost full black interior to go with it.
MY03 White/Silver H6 Outback, donor car for silver waghoon.
MY97 Silver RX, acquired to become track car, but plans changed. To be stripped and scrapped in time.

#71 Robbks

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Posted 27 February 2014 - 06:21 PM

I thought they both had one. When I took mine out there was a small one on secondary and a giant one on the primary

nope
Primary is on the Passenger side, and unless it's a very early (94-95) Gen2 GT Leggy, the Primary has the wastegate.
the Big thing on the secondary is the Exhaust Control Valve (ECV)


#72 Jimbo

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Posted 27 February 2014 - 06:41 PM

Hope this helps :

ej20tt_zpsfa41ffd0.jpg

As Rob said, early models up till '96 used a wastegate on the secondary turbos. This was then omitted in the second series of Gen2 where the primary only had a wastegate. Come Gen3, essentially it's the same operation but some revisions were made to the operation to increase changeover smoothing. 


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#73 Guest_KONG_*

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Posted 27 February 2014 - 07:23 PM

And FYI.... the secondary BOV is referred to in the manual as the "Supercharged pressure relief valve" and is also known as PRV & SPRV  ;)

 

 

That's one clean engine there too. Nice!


#74 WillC

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Posted 27 February 2014 - 09:32 PM

nope
Primary is on the Passenger side, and unless it's a very early (94-95) Gen2 GT Leggy, the Primary has the wastegate.
the Big thing on the secondary is the Exhaust Control Valve (ECV)

Ahhhh. Then thats a tiny wastegate :)

 

I always looked at it going wtf is that little thing and why is the other one ( EVC ) like an overgrown monster.



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Fairfield East NSW 2161
PH : (02) 9755 9882

#75 Robbks

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Posted 28 February 2014 - 08:01 AM

it's only a tiny little turbo


#76 Mbooma

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Posted 28 February 2014 - 08:23 AM

Thanks jimbo now i hav to got back an read it all again cuz im really confussed lol but thanks

#77 Mbooma

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Posted 28 February 2014 - 02:03 PM

Ok so ive had a read an i sorta get the trick to avoid the bbod but im still unsure of wat hose to take out an rejoin...

#78 Adam

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Posted 28 February 2014 - 02:49 PM

I'd be taking a laptop/tablet out to the car and looking at it over the engine bay :)

Posted Image

 

#79 zanzarah

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Posted 28 February 2014 - 02:55 PM

Remove Hose No:5 from the Solenoid box and T off with Hose No:22 from DPS

Remove hose No:2 completely and cap port under the intercooler.

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Liberty B4 2002 BE5 Rev E 2.5L BITURBO TF035HL-14GXT E85

#80 Robbks

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Posted 28 February 2014 - 03:01 PM

Incorrect.

Hose 5 goes to teh top port according to your diagram


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